The description (possibly copied from C.2.1 eg:value-union) says
" ...in an undefined order."
However both the xslt and xquery implementations given preserve the input
order. Either the phrase should be dropped or fn:unordered() should be
used in the implementations.
The equivalent comment in C.2.1 does not have this problem as there the
implementations use fn:distinct-values() so do return things in an
an implementation dependent (rather than undefined) order.
David
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